built 345 carburetor selection assistance needed

[HVYW8IH]

comp towing cam, .020" over pistons, stans tri-y headers, 4 barrel square bore.
MY WHOLE MOTOR IS NEW
I calculated nothing over a 500cfm would be needed. I just heard of someone on BP that has an 850cfm on THIER 345.....???

i'm leaning twords a holley

MY QUESTION: what carburetor should I mount on top of my BUILT IH powerplant that will give me good street performance and good offroad reliablity.

who loves thier carb? and what make/ model is it?

thanks,
Paul

[JackOc]

Holley 80457, is an awesome match in my opinion, its 600 cfm but just bolt right on to your squaqrebore and away ya go. I actually used a squarebore adapter on a spreadbore....very minor adjustment necessary

[Bill usn-1]

that will give me good street performance and good offroad reliablity

EFI!!
If you are actually going to use it off road then a carb just won't cut it.
If you are just going to drive down dirt roads or fire roads then a carb will be fine.

[Greg R]

Depends on your style and wallet. I believe a 350 cfm would give you a nice response, power for the trail, and good street manners without sucking on every gas pump you pass by. But some folks have a lead foot, fat wallets, and want a fat carburetor for very heavy towing or bling.

In a pinch I put a 275 cfm Holley 2BBL on my 345 equipped 1210 and I love it. It hauls heavy loads and drives nice and I average about 12 to 14, well 11 to 13 with E10, mpg. I tend to believe carbs work better a bit on the small side because of the higher air speed through them and a better atomization/mixing and metering of the fuel.

Then there's Bill's injection and a good following for that.